256600005 has 8 divisors (see below), whose sum is σ = 410560032. Its totient is φ = 136853328.

The previous prime is 256599947. The next prime is 256600007. The reversal of 256600005 is 500006652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256600005 - 2¹⁵ = 256567237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256600007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8553319 + ... + 8553348.

It is an arithmetic number, because the mean of its divisors is an integer number (51320004).

Almost surely, 2^256600005 is an apocalyptic number.

It is an amenable number.

256600005 is a deficient number, since it is larger than the sum of its proper divisors (153960027).

256600005 is a wasteful number, since it uses less digits than its factorization.

256600005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17106675.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 256600005 is about 16018.7391825949. The cubic root of 256600005 is about 635.4561006982.

Adding to 256600005 its reverse (500006652), we get a palindrome (756606657).

The spelling of 256600005 in words is "two hundred fifty-six million, six hundred thousand, five".